How many people are the same surname in Spain?

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Did you know this web: http://www.ine.es/fapel/FAPEL.INICIO?
On this web you can search how many people with the same surname as you are in Spain.
My surname is not common in Spain because is French but on this web I found that there are 100 people in Badajoz and 94 people in Zaragoza who have the same surname as me. What a surprise!